CyberResearch® Digital I/O

UCERB 24

USB LED

The USB LED indicates the communication status of the UCERB 24. It uses up to 5 mA of current and cannot be disabled. Table 3-2explains the USB LED function.

 

Table 3-2. USB LED Illumination

 

 

USB LED

Indication

illumination

 

Steady green

The UCERB 24 is connected to a computer or external USB hub.

Pulsing green

Initial communication is established between the UCERB 24 and the computer, or data is

 

being transferred.

PWR LED

The UCERB 24 incorporates an on-board voltage supervisory circuit that monitors the external 9 V power. If the input voltage falls outside of the specified range, the PWR LED shuts off. Table 3-3explains the function of the PWR LED.

 

Table 3-3. PWR LED Illumination

 

 

PWR LED

Indication

illumination

 

Steady green

External power is supplied to the UCERB 24.

Off

Power is not supplied by the external supply, or a power fault has occurred. A power fault

 

occurs when the input power falls outside of the specified voltage range of the external supply

 

(6.0 V to 12.5 V).

Invert/non-invert switch (S1)

The Invert/non-invert switch (S1) sets the relay control logic per relay bank to either inverted or non- inverted. By default, switch S1 is configured for non-invert (see Figure 3-2).

INVERT NON-INVERT

A

B

CL

S1 CH

Figure 3-2. Switch S1 default configuration

The switch labeled A configures relays 1 through 8, the switch labeled B configures relays 9 through 16, the switch labeled CH configures relays 17 through 20, the switch labeled CL configures relays 21 through 24.

ƒNON-INVERT: when "0" is written or read back via the USB bus, the relays are not energized.

ƒINVERT: when "0" is written or read back via the USB bus, the relays are energized.

Switch settings do not affect the power-on condition. Use InstaCal to read the current logic setting for each module group.

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